Check the AC power relay - located under the front hood - near the fan. It has wires colored BRN, BRN, BLK, PNK on it. You should be able to swap in a diffferent relay from a different socket of the car. The High Speed Blower Motor relay is right there also - so if you take that one to test it will kill the blower motor - but only on high speed.
The high speed blower motor relay has wires that are RED, ORN, PPL, AND BLK.
So if you swap them to test - assuming they are the same physical size, and then everything works but the blower on high - then the relay is bad for sure.
Having that relay out will only kill the blower motor on high. The AC Power Relay will kill the blower at any speed, plus the A/C compressor functions.
The motors that move the heat doors do not run through the AC Power Relay however.
[This message has been edited by phonedawgz (edited 09-06-2011).]
I have the same issue good fuses and relays, tried switching the relays in the spare tire area and nothing. HVAC blower motor does not turn on and there is no power even going to the motor. When switched from vent to floor or defrost i can hear it switching but no air comes out. Bad switch maybe? It has the Firebird HVAC controls. (firebird dash) Worked 6 years ago when parked now nothing. The blower spins freely however i did check that as well. Any ideas?
------------------ Black 1986 Fiero GT, L67, 5 Speed, Firebird dash and door panels. 2006 GMC Sierra 2500HD LBZ Duramax 2006 Infinity G35 4 door (Wife's car)
Any ideas? I would have drove her to work today (working on Christmas best gift ever no family fights for me!) but without heat its no fun to drive while shivering lol. Thank you all in advance!
------------------ Black 1986 Fiero GT, L67, 5 Speed, Firebird dash and door panels. 2006 GMC Sierra 2500HD LBZ Duramax 2006 Infinity G35 4 door (Wife's car)
[This message has been edited by CoFieroGt (edited 12-25-2013).]
Looking at a Mitchel's diagram for an 85GT w/AC. I've had them be wrong. However. Shows power into the heater control switch. When heater control is on anything but off, power is fed to blower motor switch and Hi speed relay. This is where it can wrong. Power into the heater control is orange. Power into the blower motor switch is brown. Power to the relay is red, with on request orange from blower motor switch. If you have no speeds and no power to blower motor. It can be no power to heater controls(fuse), the on/off switch in the heater control or blower motor switch. Pull the heater controls. The largest wires into the controls and to the blower motor switch should be the blower motor power feed. Check for power in and out of the control switch. With the control switch on any mode, you should see power at least 2 of the wires at the blower motor switch. If no power to the blower motor switch but power into the heater control switch, heater control switch. If power in to blower motor switch and no power on any other wire at the blower motor switch, blower motor switch. Power out will change depending on speed. If only HI, resistor pack or blower motor switch. All but no Hi, Hi speed relay. No speeds and power to blower motor, blower motor or not uncommon, burnt ground. This should apply to most GMs without Climate control, without BCM or without off position at blower motor switch. Some supply power to low speed of blower motor any time key is on.
Looking at a Mitchel's diagram for an 85GT w/AC. I've had them be wrong. However. Shows power into the heater control switch. When heater control is on anything but off, power is fed to blower motor switch and Hi speed relay. This is where it can wrong. Power into the heater control is orange. Power into the blower motor switch is brown. Power to the relay is red, with on request orange from blower motor switch. If you have no speeds and no power to blower motor. It can be no power to heater controls(fuse), the on/off switch in the heater control or blower motor switch. Pull the heater controls. The largest wires into the controls and to the blower motor switch should be the blower motor power feed. Check for power in and out of the control switch. With the control switch on any mode, you should see power at least 2 of the wires at the blower motor switch. If no power to the blower motor switch but power into the heater control switch, heater control switch. If power in to blower motor switch and no power on any other wire at the blower motor switch, blower motor switch. Power out will change depending on speed. If only HI, resistor pack or blower motor switch. All but no Hi, Hi speed relay. No speeds and power to blower motor, blower motor or not uncommon, burnt ground. This should apply to most GMs without Climate control, without BCM or without off position at blower motor switch. Some supply power to low speed of blower motor any time key is on.
Thank you I will try and check power to the switch this weekend and see if i am getting anything in or out.
------------------ Black 1986 Fiero GT, L67, 5 Speed, Firebird dash and door panels. 2006 GMC Sierra 2500HD LBZ Duramax 2006 Infinity G35 4 door (Wife's car)
Alright figured it out was a wire that came apart apparently my uncle twisted and electrical taped a few wires when switching to firebird controls and this one came apart got it all soldered and heat shrinked now should be good to go thanks for all your help.
------------------ Black 1986 Fiero GT, L67, 5 Speed, Firebird dash and door panels. 2006 GMC Sierra 2500HD LBZ Duramax 2006 Infinity G35 4 door (Wife's car)
